Submarine signaling cable



Aug. 30, 1932. J. J.-GILB ERT SUBIARINE SIGNALING CABLE Filed lay 18.1929 J J. 6/4. BERT ATTORNEY l UNITED STATE a onacnonxns,.moonronnmnn,on nwyomn. Y.,mcon1onAmIo on nnwtron q v This invention relatestosubmarinesignal-f SUBMARIITE sierra QABLE. i

. Application filedbfiay ls,. IBQSL seri itascaiia ing cables in generaland more a b particularly to cables of lthe twin core type.

of long loadedsubmarine telephonecables. Q A further object [of theinventionis to relosses of a twin core submarine signaling 7 a. In orderto protect the gutta nerchaor other thermoplasticinsulation fofthe coreoff a submarine signalingcable from the attacks customaryto surround fsuch"portionsof the core which are l able. to lthe attacks with a metallayer 'suchfas lbrassq However, in the i flerjating at frequencies in'the voicelrange or highenthe eddy current losses inileredo tape 1 caseof twin eore'cablesof great length 0p b of the usual dimensions become afactor of I importance. Such is the .casenot onlywhen Teredotapebutalsowhen both eores are sure the cores each are surrounded by. aseparate rounded byja common Teredo tape. QBymeth- I thetape.

" The Tere Code of analysisnot necessarytobe stated here itmay beshownthat the losses occurring in: a 7' twin or other multiple core cablewitheither ofthese typeset Teredoltape of the usual. e dimensions: aremoretroublesome than with Wsingle core xconstru ytidnq These losses increase the.attenuation 'ofthe signaling currents considerably and resultin generalffrom .the. presence of.auriagnetidfieldhaving I I componentperpendicular to the surface of other 1 high. frequency telephoneconductors but-is not limitedyin its applicationeitherfto duce thatportion ofthe dissipative electrical cable which aredue to the presenceot protective metallic envelopes such as Teredog f tapes.

dotapes as heretofore use lfhave '1 a widthor about oneinch. Such tapeson-a e twin core conductor would. causelarge losses -especially atvoiceandjjhigher frequencies.

i} In? order to decrease thesei losses, thisfiin- 1 il ventionproposesito depart fromfi previous F9 practice by usingta subdividedTereidofpr tectiveisheath suchas a large number of tapes of" greatlyreduced; or of oonvolutions -11118 invention is primai'ily a pl et bigw. continuously loaded twin core telephonefor,

loaded colnductors or frequenciesias high as voice frequenclesbw M.LFig. Lot the accompanylng drawing d scloses a form ofith e inventionin which the two cores of a it wi'n corecable have indif @Fig. .2discloses an arrangementinawhich vidual lavers of Teredo tap eappliedftheretoi;

the two cores are surrounded withxa single wires closely spaced j :111both figures 1 of the layer of Teredo protection in the formaof fine drin o ductors of the cable may consist of thejusual.

.1 of Teredoes or other submar ne borers, itls :11 having appliedthereto'lo'ading material 12 in the form of tape or wire which .isaimsbedded in semi-liquid pressure equalizing .inaterial 12a,1the insulatingmaterial 13, lay

ers 14: andv16; of ute and .armoring. wire 18 being 0t suitableconstruction asindicatedp Referring more particularly. to Figbl .the

two, \or four or. any jother suitable number of relatively narrow tapesa pplied'swith a slight overlay as indicated. Theoverlappingpar'ts,orthe entireinneritapesurface, ma

be insulated ftomdeach other L by-means of metallic oXide,1a' layer: offabric imnregnated with bituminous'material or other; suitablein -bsulating agentsknown in the art. seeilfor example, Gilberts U. 11S.Patent 1,700,476; :Jan-

Tezbedoi protecting layermay consist of one, i

uaty329,f1'929.l The width of the tape 15 may. i

be asa maximum inch (12.7 mm.) andmay be narrower than down totheextreme casein which thetape assumes the xform of wire. The Teredo tape'or tapes 15 may be I severally surroundedby fabric tape 17 -pro videdfor the .purposeof avoiding conductive fcontactof the metallic tape orta pesoftone i core. with the tape or tapes of the other.

In the construction of Fig.2 a single Teredo protecting. layer is laidabout the worming ofjutebl which serves to make two cores

